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Search Results: 1 - 10 of 401251 matches for " M. Quiroga "
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Estado del arte en modelación funcional-estructural de plantas
FERNANDEZ QUIROGA,M. PAULINA;
Bosque (Valdivia) , 2005, DOI: 10.4067/S0717-92002005000200009
Abstract: the advances in trees and plants architecture and their physiology analysis, and on the other hand the advances in computer sciences, have permitted the development of 3d structural plant models. the basic modeling units are usually leaves internodes, buds and fruits or flowers. the state of the art is presented in this kind of models, as are also the functional-structural models that are integration between structural models and physiological ones. some tools and concepts used in this kind of modeling, as l-systems, automata cellular, stochastic modeling, are also presented. the future trend will be a stronger development of these models, including variations due to environment and management, in order to support the decision taking.
Estado del arte en modelación funcional-estructural de plantas State of the art in functional-structural plant modeling
M. PAULINA FERNANDEZ QUIROGA
Bosque (Valdivia) , 2005,
Abstract: Los avances en el análisis de la arquitectura o estructura de los árboles y plantas y su fisiología y, por otra parte, los avances en el área de la computación, han permitido desarrollar modelos estructurales tridimensionales del desarrollo de vegetales, usando generalmente como unidad mínima a modelar las hojas, internudos, yemas y frutos. Se presenta el estado del arte en este tipo de modelos, así como los modelos funcionales-estructurales, que integran modelos estructurales con modelos de procesos fisiológicos en la planta. Algunas herramientas usadas para este tipo de modelación, tales como Sistemas L, concepto de autómata celular, modelación estocástica, son presentadas. Se observa que la tendencia a futuro será desarrollar más este tipo de modelos integrados, incluyendo variaciones debido al ambiente y manejo, de manera de que apoyen la toma de decisiones. The advances in trees and plants architecture and their physiology analysis, and on the other hand the advances in computer sciences, have permitted the development of 3D structural plant models. The basic modeling units are usually leaves internodes, buds and fruits or flowers. The state of the art is presented in this kind of models, as are also the functional-structural models that are integration between structural models and physiological ones. Some tools and concepts used in this kind of modeling, as L-Systems, automata cellular, stochastic modeling, are also presented. The future trend will be a stronger development of these models, including variations due to environment and management, in order to support the decision taking.
Relaciones biométricas y fecundidad de Glyphocrangon alata (Faxon, 1893) en la zona norte de Chile (21°19'S; 70°20'W)
Quiroga J.,Eduardo; Soto M,Raúl;
Investigaciones marinas , 1997, DOI: 10.4067/S0717-71781997002500021
Abstract: ovigerous females (41 specimens) from glyphocrangon alata, captured between iquique and arica allowed to extend to the latitudinal and bathymetric distribution of the species. relations carapace length/carapace width and carapace length/total length are linear at all morphological ranges. carapace length and total varied between 21.9-33.1 and 68.5-103.3 mm, respectively. a fecundity relation is described by a linear regression of carapace length/carapace volume for a range of 17 to 179 eggs; fresh-laid egg volume: 15.68 mm3. the eggs being big size and few characterize the species as having a low fecundity and a direct embryonic development. a reproductive output of 0.118, based on wet weight values was calculated; it stands near the caridean shrimp values from polar and temperate regions. the study was derived from a report project from the united nations development programme (undp)
Implementación de un mantenimiento basado en la condición usando modelado y simulación: caso de estudio de un motor sincrónico de imanes permanentes
Quiroga Méndez,Jabid; Oviedo Castillo,Silvia;
Ingeniería e Investigación , 2011,
Abstract: this paper introduces condition-based maintenance (cbm) architecture regarding an electrical application. appropriate and efficient fault detection constitutes one of the major challenges associated with cbm and a modelbased approach constitutes the way to achieve it. a case study using a permanent magnet synchronous motor (pmsm) is presented to illustrate implementing cbm using a neural network motor model. cbm may be implemented in real time using matlab and dspace. the difference between line currents′ negative sequence components, predicted by a multilayer neural network, and the current values acquired from the motor is used as fault indicator. experimental results have shown the efficiency of the proposed model in detecting several stator winding short faults in differing load conditions and fault severity, obtaining up to 95% reliability.
Factor de crecimiento semejante a la insulina tipo I (IGF-I) y cirrosis hepática
Conchillo,M.; Prieto,J.; Quiroga,J.;
Revista Espa?ola de Enfermedades Digestivas , 2007, DOI: 10.4321/S1130-01082007000300007
Abstract: insulin-like growth factor i (igf-i) is a polypeptide hormone secreted by multiple tissues in response to growth hormone (gh). it is partly responsible for gh activity, and also has glucose-lowering and anabolizing effects. ninety percent of circulating igf-i originates in the liver and has autocrine, paracrine, and endocrine effects, the latter on multiple tissues. liver cirrhosis results in a progressive decline of hepatic igf-i output, and this factor may become undetectable in advanced disease. some cirrhosis complications, mainly those nutritional and metabolic in nature (insuline resistance, malnutrition, osteopenia, hypogonadism, intestinal disorders), may be at least partly related to this igf-i deficiency, since some igf-i effects represent a reverse image of cirrhosis complications. despite this, igf-i replacement therapy has been never suggested for cirrhosis. a number of experimental studies in cirrhotic rats showed that therapy using low-dose recombinant igf-i exerts two types of effect on experimental cirrhosis: a) liver improvement driven by improved hepatocellular function, portal hypertension, and liver fibrosis; and b) cirrhosis-related extrahepatic disorder improvement driven by improved food efficiency, muscle mass, bone mass, gonadal function and structure, and intestinal function and structure, with a normalization of sugar and amino acid malabsorption, and improved intstinal barrier function, manifested by reduced endotoxemia and bacterial translocation. subsequently, the first randomized, double-blind, placebo-controlled, pilot clinical trial in a small number of cirrhotic patients showed increased serum albumin and improved energy metabolism as a result of igf-i use. further clinical trials are needed to identify adequate igf-i doses, administration duration and frequency, and the subgroup of cirrhotic patients who will benefit most from this replacement therapy.
Implementing condition-based maintenance using modeling and simulation: a case study of a permanent magnet synchronous motor Implementación de un mantenimiento basado en la condición usando modelado y simulación: caso de estudio de un motor sin-crónico de imanes permanentes
Quiroga Méndez Jabid,Oviedo Castillo Silvia
Ingeniería e Investigación , 2011,
Abstract: This paper introduces condition-based maintenance (CBM) architecture regarding an electrical application. Appropriate and efficient fault detection constitutes one of the major challenges associated with CBM and a model-based approach constitutes the way to achieve it. A case study using a permanent magnet synchronous motor (PMSM) is presented to illustrate implementing CBM using a neural network motor model. CBM may be implemented in real time using Matlab and dSpace. The difference between line currents' negative sequence components, predicted by a multilayer neural network, and the current values acquired from the motor is used as fault indicator. Experimental results have shown the efficiency of the proposed model in detecting several stator winding short faults in differing load conditions and fault severity, obtaining up to 95% reliability. Este artículo introduce la arquitectura de un CBM (mantenimiento basado en la condición) en una aplicación eléctrica. La detección de fallas de manera oportuna y eficiente constituye uno de los retos más importantes asociados al CBM y el enfoque basado en modelos en el medio para conseguirlo. Un caso de estudio en un motor sincrónico de imanes permanentes (PMSM) es ejecutado para ilustrar cómo el modelado es utilizado en la implementación de un CBM. El monitoreo fue implementado en tiempo real usando Matlab y dSpace . Se emplea como indicadora de falla la diferencia entre los valores de la componente secuencial negativa para las corrientes predichas usando una red neuronal multicapa y la corriente obtenida del motor. Resultados experimentales demostraron la efectividad del modelo propuesto en la detección de la falla de cortocircuito en el estator en distintos niveles de severidad y carga, obteniendo una confiabilidad en la detección mayor al 95%.
Factor de crecimiento semejante a la insulina tipo I (IGF-I) y cirrosis hepática Insulin-like growth factor I (IGF-I) and liver cirrhosis
M. Conchillo,J. Prieto,J. Quiroga
Revista Espa?ola de Enfermedades Digestivas , 2007,
Abstract: El factor de crecimiento semejante a la insulina tipo I (IGF-I) es una hormona polipeptídica segregada en múltiples tejidos por efecto de la hormona de crecimiento (GH). Es responsable de parte de las acciones de la GH y además tiene efecto hipoglucemiante y anabolizante. El 90% del IGF-I circulante es de origen hepático y ejerce efectos autocrinos, paracrinos y endocrinos, estos últimos en múltiples tejidos. En la cirrosis hepática se produce una disminución progresiva de la producción hepática de IGF-I que llega a ser indetectable en la enfermedad avanzada. Algunas de las complicaciones de la cirrosis, fundamentalmente nutricionales y metabólicas (resistencia a insulina, desnutrición, osteopenia, hipogonadismo, alteraciones intestinales) podrían estar, al menos en parte, relacionadas con esta carencia de IGF-I dado que algunas acciones de IGF-I representan la imagen inversa de las complicaciones de la cirrosis. A pesar de ello, nunca se había propuesto tratamiento sustitutivo con IGF-I en la cirrosis. En una serie de estudios experimentales realizados en ratas cirróticas se demostró que el tratamiento con dosis bajas de IGF-I recombinante produce dos tipos de efectos en la cirrosis experimental: a) mejoría del hígado, dado que mejora la función hepatocelular, la hipertensión portal y la fibrosis hepática; y b) mejoría de las alteraciones extrahepáticas de la cirrosis dado que mejora la eficiencia del alimento ingerido, la masa muscular, la masa ósea, la función y estructura gonadales y la función y estructura intestinales con normalización de la malabsorción de azúcares y aminoácidos y la mejoría de la función intestinal de barrera manifestada por disminución de la endotoxemia y la translocación bacteriana. Posteriormente el primer ensayo clínico piloto, aleatorizado, doble ciego y controlado con placebo llevado a cabo en un número reducido de pacientes cirróticos demostró aumento de la albúmina sérica y mejoría del metabolismo energético por efecto del IGF-I. Se precisan ensayos clínicos adicionales para identificar la dosis adecuada de IGF-I, el tiempo y ritmo de administración y el subgrupo de pacientes cirróticos que obtendrán mayor beneficio de este tratamiento sustitutivo. Insulin-like growth factor I (IGF-I) is a polypeptide hormone secreted by multiple tissues in response to growth hormone (GH). It is partly responsible for GH activity, and also has glucose-lowering and anabolizing effects. Ninety percent of circulating IGF-I originates in the liver and has autocrine, paracrine, and endocrine effects, the latter on multiple tissues. Liver cirrh
Relaciones biométricas y fecundidad de Glyphocrangon alata (Faxon, 1893) en la zona norte de Chile (21°19'S; 70°20'W) Biometrics relationship and fecundity of Glyphocrangon alata (Faxon, 1893) in northern Chile (21°19'S; 70°20'W)
Eduardo Quiroga J.,Raúl Soto M
Investigaciones Marinas , 1997,
Abstract: Hembras ovígeras (41 especímenes) de Glyphocrangon alata, capturadas entre Iquique y Arica permitieron extender los rangos de distribución latitudinal y batimétrica de esta especie. Las relaciones entre longitud/ancho del caparazón y longitud del caparazón/longitud total son lineales en todas las tallas. La longitud del caparazón y la longitud total variaron entre 21,9-33,1 y 68,5-103,3 mm, respectivamente. La relación de fecundidad está descrita por una regresión lineal de la longitud/volumen del caparazón para un rango de 17 a 179 huevos. El volumen de loshuevos frescos fue de 15,68 mm3.. . Los huevos, pocos y grandes, caracterizan esta especie como de baja fecundidad y de desarrollo embrionario directo. El rendimiento reproductivo de 0,118, se calculó sobre la base del peso húmedo; este valor es parecido al de los camarones carideos de regiones polares y templadas. Este estudio se efectuó dentro del Programa de desarrollo de las Naciones Unidas (PNUD) Ovigerous females (41 specimens) from Glyphocrangon alata, captured between Iquique and Arica allowed to extend to the latitudinal and bathymetric distribution of the species. Relations carapace length/carapace width and carapace length/total length are linear at all morphological ranges. Carapace length and total varied between 21.9-33.1 and 68.5-103.3 mm, respectively. A fecundity relation is described by a linear regression of carapace length/carapace volume for a range of 17 to 179 eggs; fresh-laid egg volume: 15.68 mm3. The eggs being big size and few characterize the species as having a low fecundity and a direct embryonic development. A reproductive output of 0.118, based on wet weight values was calculated; it stands near the caridean shrimp values from polar and temperate regions. The study was derived from a report project from the United Nations Development Programme (UNDP)
El poblamiento rural en torno a Lugo en la transición de la antigüedad al feudalismo (ss. V-X)
Lovelle, Mónica R.,Quiroga, Jorge L.
Cuadernos de Estudios Gallegos , 2000,
Abstract: Not avalaible No disponible
Abscess secondary to facial snakebite
QUIROGA, M.;AVILA-AGüERO, M. L.;FAINGEZICHT, I.;
Journal of Venomous Animals and Toxins , 2000, DOI: 10.1590/S0104-79302000000200009
Abstract: in costa rica, approximately 700 snakebite cases occur each year, 5 to 10 of which result in death. at the hospital nacional de ni?os (hnn), 6 to 10 cases are reported annually, more than half of these cases and nearly all deaths are result from bothrops asper snakebite. this venomous snake, popularly known as the "terciopelo", most often attacks the lower or upper limbs and characteristically produces local tissue damage, which can be severe. the following is a report of the first case of a non-fatal and unusual facial bite caused by bothrops asper in our country.
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